Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 48,902	$ 61,661
Short-term investments	138,395	249,127
Accounts receivable, net of allowances of $4	2,913	4,825
Inventory	4,755	1,948
Prepaid expenses and other current assets	3,395	4,434
Total current assets	198,360	321,995
Property and equipment, net of accumulated depreciation and amortization of $59,936 and $58,623, respectively	16,299	17,687
Goodwill	44,543	44,543
Other intangible assets, net of accumulated amortization of $2,795 and $1,471, respectively	50,561	51,885
Other assets	429	429
Total assets	310,192	436,539
Current liabilities:
Accounts payable	51,480	57,652
Accrued liabilities	13,794	12,282
Current portion of deferred revenue	2,117	40,099
Current portion of long-term debt, net of deferred issuance costs	1,115	14,094
Total current liabilities	68,506	124,127
Deferred revenue, net of current portion	20,991	22,428
Long-term debt, net of deferred issuance costs	243,830	231,576
Deferred tax liabilities	6,014	6,014
Other long-term liabilities	252	292
Total liabilities	339,593	384,437
Commitments and contingencies
Equity:
Preferred stock, $.01 par value; 5,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $.001 par value; 225,000 shares authorized; 106,134 and 105,711 shares issued, respectively	106	106
Additional paid-in capital	1,444,925	1,435,526
Accumulated deficit	(1,471,485)	(1,381,404)
Accumulated other comprehensive loss	(71)	(222)
Treasury stock, at cost, 236 and 122 shares, respectively	(2,876)	(1,904)
Total equity	(29,401)	52,102
Total liabilities and equity	$ 310,192	$ 436,539